A mother bought three dress for her triplets daughters(one for each) and put the dresses in the dark. One by one the girls come and pick a dress.
What is the probability that no girl will choose her own dress?

Find the next number in the sequence

1, 2, 6, 21, 88, __?

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

Rearrange the letters in "new door" to make one word.

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

What can you serve, but never eat?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

If,
9 * 8 * 7 = 65
8 * 7 * 6 = 50
7 * 6 * 5 = 37

Find
6 * 5 * 4 = ?